diff --git a/include/uianimation.idl b/include/uianimation.idl
index 631af118990..70c710cdf89 100644
--- a/include/uianimation.idl
+++ b/include/uianimation.idl
@@ -585,7 +585,8 @@ interface IUIAnimationTransitionLibrary : IUnknown
 library UIAnimation
 {
     [
-        uuid(bfcd4a0c-06b6-4384-b768-0daa792c380e)
+        uuid(bfcd4a0c-06b6-4384-b768-0daa792c380e),
+        threading(both)
     ]
     coclass UIAnimationTimer
     {
@@ -593,7 +594,8 @@ library UIAnimation
     }
 
     [
-        uuid(4c1fc63a-695c-47e8-a339-1a194be3d0b8)
+        uuid(4c1fc63a-695c-47e8-a339-1a194be3d0b8),
+        threading(both)
     ]
     coclass UIAnimationManager
     {
@@ -601,7 +603,8 @@ library UIAnimation
     }
 
     [
-        uuid(8a9b1cdd-fcd7-419c-8b44-42fd17db1887)
+        uuid(8a9b1cdd-fcd7-419c-8b44-42fd17db1887),
+        threading(both)
     ]
     coclass UIAnimationTransitionFactory
     {
@@ -609,7 +612,8 @@ library UIAnimation
     }
 
     [
-        uuid(1d6322ad-aa85-4ef5-a828-86d71067d145)
+        uuid(1d6322ad-aa85-4ef5-a828-86d71067d145),
+        threading(both)
     ]
     coclass UIAnimationTransitionLibrary
     {